LIGHTING SYSTEM Interior Light Switch Signal Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the door switch and front dome light switch.

WIRING DIAGRAM

B004FESE02

CAUTION / NOTICE / HINT

Note

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Dome Light DOOR SW Door switch signal ON or OFF

      ON: Door switch pressed

      OFF: Door switch not pressed

      		 -
      Dome Light SW Front dome light switch signal ON or OFF

      ON: Front dome light switch ON

      OFF: Front dome light switch OFF

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Dome Light DOOR SW
      Dome Light SW
      OK
      Normal conditions listed above are displayed.
      Result
      Result Proceed to
      OK A
      Dome Light DOOR SW is not normal B
      Dome Light SW is not normal C

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND) Click here

    B

  2. INSPECT MAP LIGHT ASSEMBLY


    1. Remove the map light assembly.

      Click here

    2. Inspect the map light assembly.

      Click here

      OK
      Map light assembly is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAP LAMP ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      W4-18 (DOOR) - O1-27 (DMDR) Always Below 1 Ω
      W4-19 (CILL) - O1-28 (DMON) Always Below 1 Ω
      W4-20 (GND9) - Body ground Always Below 1 Ω
      W4-18 (DOOR) or O1-27 (DMDR) - Body ground Always 10 kΩ or higher
      W4-19 (CILL) or O1-28 (DMON) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the W4 map light assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      W4-19 (CILL) - O1-28 (DMON) Always Below 1 Ω
      W4-20 (GND9) - Body ground Always Below 1 Ω
      W4-19 (CILL) or O1-28 (DMON) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT MAP LAMP ASSEMBLY


    1. Replace the map lamp assembly with a new or known good one.

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Main Body / Data List.

    6. Read the Data List according to the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Dome Light SW Front dome light switch signal ON or OFF

      ON: Front dome light switch ON

      OFF: Front dome light switch OFF

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Dome Light SW
      OK
      Normal conditions listed above are displayed.
      Result
      Result Proceed to
      Dome Light SW is normal A
      Dome Light SW is not normal B

    A

    END (MAP LAMP ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here